This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0), which permits reproduction, adaptation, and distribution provided the original author and source are credited. AbstractThere have been few studies about the pollinators of bromeliads of the genus Encholirium. Considering this lack of information, this study comes to fill a gap in the literature on the floral visitors and potential pollinators of E. spectabile. In order to perform this study, we observed the inflorescence of this species between 2011 and 2014 (four years of observation), in the semiarid region of Santa Maria municipality (Rio Grande do Norte state, northeastern Brazil). Floral visitors were observed through focal method. The observations were made during the day, starting at 06h a.m. until 06h p.m., and at night from 07h until 11h59 p.m. In about 1,800 hours of observations, 24 species were recorded visiting E. spectabile flowers, including 4 species of moths (Lepidoptera: Sphingidae and Geometridae), 3 species of bees (Hymenoptera: Apidae), 4 species of hummingbirds (Aves: Trochilidae) and 2 species of bats (Chiroptera: Phyllostomidae), among others. Based on these results, we propose that the macambira bromeliads (E. spectabile) should be considered as key elements in the conservation of various taxonomic groups in the semiarid region, through the umbrella species theory as already proposed for other species of Bromeliaceae. Keywords: associated fauna, caatinga biome, macambiras, Encholirium spectabile, biodiversity. ResumoExistem poucos estudos a respeito dos polinizadores de bromélias do gênero Encholirium. Dessa forma, este estudo vem preencher a lacuna na literatura sobre os visitantes florais e potenciais polinizadores de E. spectabile. Para sua realização, observamos a inflorescência dessa espécie no período de 2011 a 2014 (quatro anos de observações), na região semiárida, no município de Santa Maria, Rio Grande do Norte, Brasil. Os visitantes florais foram registrados por meio do método focal. As observações foram conduzidas durante o dia, começando às 06h da manhã e seguindo até às 18h e, à noite, das 19h às 23h59min. Em cerca de 1.800 horas de observação, 24 espécies foram registradas visitando a inflorescência de E. spectabile, incluindo 4 espécies de mariposas (Lepidoptera: Sphingidae e Geometridae), 3 espécies de abelhas (Hymenoptera: Apidae), 4 espécies de beija-flores (Aves: Trochilidae) e 2 espécies de morcegos (Chiroptera: Phyllostomidae), entre outros. Com base nesses resultados, e subsidiados pela teoria das espécies guarda-chuva, sugerimos que as bromélias macambiras (E. spectabile) sejam consideradas como elementos chave na conservação de vários grupos taxonômicos de região semiárida.Palavras-chave: fauna associada, bioma caatinga, macambiras, Encholirium spectabile, biodiversidade.

Bromeliads are important habitats for reptiles and amphibians, and are constantly used as shelter, refuge, foraging or thermoregulation sites due to their foliar architecture, which allows for constant maintenance of humidity and temperature. This study aimed to identify the herpetofauna inhabiting the non-phytotelmata rupicolous bromeliad Encholirium spectabile Mart. ex Schult. & Schult.f. and to analyze the microhabitat usage of these bromeliads by different species in the Caatinga of northeastern Brazil. From January 2011 to August 2012, we collected data by active search throughout three paralel transects in a rock outcrop in the municipality of Santa Maria, state of Rio Grande do Norte. We recorded four species of anuran amphibians, six lizards, and seven snakes in the bromeliads. The average air temperature was lower and air humidity higher inside than outside the bromeliads, and bromeliads at the rock outcrop borders had lower temperatures and higher humidity than those at the center. We found a significant difference in the distribution of individuals throughout the rock outcrop, with most specimens found at the borders. We also found significant differences regarding the use of each microhabitat by the taxonomic groups, with lizards and snakes using green leaves and dry leaves evenly, along with fewer records in inflorescence stems, and anurans mainly using green leaves, with few records on dry leaves, and no records in the inflorescence stems. This study highlights rupicolous bromeliads as key elements in the conservation and maintenance of amphibians and reptiles in the rock outcrops of Brazilian semi-arid Caatinga.

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